FunCom_Mod3_Quiz

In amplitude modulation, the carrier signal is varied in proportion to:

• The frequency of the message
• The amplitude of the message
• The phase of the carrier
• The bandwidth of the channel

A radio station transmits voice using AM. The main advantage of AM is:

• Simple receivers and demodulation
• Very high spectral efficiency
• Resistance to noise
• Low power consumption

A disadvantage of AM compared to FM is:

• Higher bandwidth requirement
• More susceptible to noise
• Complex receivers
• Narrower coverage

The form of AM that transmits both sidebands and carrier is:

• DSB-SC
• SSB
• Standard AM (DSB + carrier)
• VSB

Which form of AM is most bandwidth-efficient?

• Standard AM
• DSB-SC
• SSB
• VSB

The ITU designation A3E refers to:

• Double sideband with full carrier
• Single sideband with suppressed carrier
• Vestigial sideband
• Double sideband suppressed carrier

The ITU designation J3E refers to:

• SSB with suppressed carrier
• SSB with full carrier
• DSB with carrier
• VSB

The AM wave equation can be expressed as:

• v(t) = Ac[1 + m \cos(\omega_m t)] \cos(\omega_c t)
• v(t) = Ac \cos(\omega_c t + \phi)
• v(t) = Am \sin(\omega_m t)
• v(t) = Ac \cos(\omega_m t)

The modulation index in AM is defined as:

• Ratio of carrier to message frequency
• Ratio of message amplitude to carrier amplitude
• Ratio of bandwidth to carrier
• Ratio of power to sidebands

If the carrier amplitude is 10 V and the message amplitude is 5 V, the modulation index is:

• 0.25
• 0.5
• 1
• 2